The armies of Kirby and Waddle Dee battle it out on a 7 x 7 game board where the rules of Reversi apply. The game starts with two Kirbys and two Waddle Dees positioned in the center of the board. By playing additional Kirbys or Waddle Dees to surround enemy pieces horizontally, vertically, or diagonally, they are captured and flipped to join the Kirby or Dee army. The game ends when the board is filled with the majority of one character.